docs: def call(command, working_directory=config.BASE_DIR):
      """
      Executes shell command in a given working_directory.
      Command is a list of strings to execute as a command line.
      Returns a tuple of two byte strings: (stdout, stderr)
  
      """
      LOG.info(command)
      proc = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE, cwd=working_directory, shell=True)
      out, err = proc.communicate()
      return (out, err)